Audemars Piguet is perhaps most widely known for its Royal Oak series, and for good reason. The brash and immediately recognizable sports watch speaks to a fusion of collectibility, craftsmanship, and chunky toughness that’s difficult to replicate, even among the grand maisons. In many ways, the watch featured here is the antithesis to the Royal Oak: crafted from rare platinum instead of stainless steel, made to be as slim and elegant as possible, and more importantly, possessing one of the great complications from a vintage era: the perpetual calendar.